Portable reciprocating power saw



Apr 5 192?,

l',i623,308 .1. DEMAND l WINDSHIELD WIPER Filed June 7, 1921 2Sheets-Sheet 1k noentoz dde/a5 @ma/m0, 3313 @Home/110 i Y M @U4/171mm'Patented Apr. 5, 1927.

Louis GEORGE Econoivr, `or Non'rii rLAINFIELn, NEW JERSEY. 'i

y PORTABLE nncrrnocnirrns lieownia saw. n

kA'pplea'cioii,filed October 7, 1924. Seriali'No. 742,120.

This invention relates to saws and more particularly is directed to animproved portable reciprocating power saw;

Among the objects of the invention there is. provided a device of thecharacter described with novel means for automatically feeding thesaw/blade relative to the work during the cutting operation,.sa id meansincludingan improved7 universally adjustable member secured to thecasing of the saw and' partbe lobvious and in. `part hereinafter pointedout.'

The invention accordingly consists in the features lof construction,combinations ofv elements and arrangementof parts `which will beexemplified in the construction hereinafter described and of which theAscope of application will be indicated in thefollowing claims.' p z Inthe accompanying drawing, in which is shown one of the various possibleillustrative embodiments 4of this inventiom. y Fig. 1 is aplan'view of asaw vembodying the invent-ion with parts broken away to eX- pose theinterior; i

Fig. 2 is a front yelevational view corresponding to Fig. 1 with partsbroken away to show the interior construction;

Fig. 3 isa cross-'sectional view taken on line 3-3 of Fig. 1;.and

Fig 4 is a cross-sectional view'taken on line 4-4 in Fig.A 2y.

yReferring in detail to the drawing, 1Q d enotes a casing comprising aVsupporting frame 10a and a Jfront side cover l()b for carrying andenclosing-a reciprocatingdrive mechanism for a 'saw-4 embodyingtheinvention., said casing beingpreferably made of metal, such as castaluminum ort-he like material.v A Suitable handle 11 may be'provided atthe rear end of the casing '10,over

which may be mounteda power unit such as an electric motor12 providedwith afinger operated control switch 12? on yjhandle '11. The frontendportion 'of the casing 101nay be constructed to support and guidevthe saw bladetl which isarranged to passvinto the casinglO through afront opening 10Q.

Any vsuitably designed reciprocating drive y mechanism for the blade 13may be `provided. yThe one shown in the drawing is seen to include aspeed reduction gearing pinion 14 meshingv with a consisting of a gearwheel 15, the pinion 14 being' secured to be driven by the motor12 andthe wheel 15 being mountedto drive ai horizontally f extending shaft 1.6which isx-journaledfina suitable bearing provided by an upwardly.

extending portion 10d of casing`10 adjacent the motor 12 as shown inFig. 2.] To change the rotary driving motion to a reciprocating motion,the";t'ront end of shaft 16 is provided with a balanced crank arm 18 onwhich a crank pin 19 is secured, yand theflatter'is' arranged tol engagewith av cross-headpiece 20 whichis adapted to"reciprocate`trans-`1yersely in' an, oscillating slotted guide inemer21. "v

Ak bell'crankp22 pivotally mountedon an i overhanging bearing bolt 28which `is mounted on an upwardly` extending 'portion l10e of casing 10has ashort rearwardly .eXtend- `ing arm 22a which is provided with abifur-` cated end 22b forsupporting theguide meine ber 21 and. a longvdownwardly extending4 arm 22c which is providedv with afslott'ed opening22d to serve asa guide fora crossk head piece 24v as shown in Fig. 2.Engaging e with said piece 24 to .reciprocate the `saw blade-13 is awrist-pin 25 which issecured" to the side of a rearwardly lextendingportion 13?u o'fsaid saw, said latter portionla being provided withanupper'and lower guiding edge `strip 26 and 27 respectively. Preferablyeach of said strips'are releasably secured to the saw blade 13 bysuitable fastening means suchv as screws 28, and the upper strips 26 mayhave a ytoothed rack 26BLA ,1

formed uthereon for theV purpose hereinafter to appear.

The front vertically extending' edge' por-f tions 10` and 10h of theiramel()a and the cover 10b respectively form the side wallsA j of theopening'lOc'through which saw blade 13 passes, and said portion-lOfand-f1Oh may beprovided with grooves 10i for .receiving suitableresilient absorbent liners 29, such as felt or the like material, whichare arranged to contact with the sides Aofthe saw vlolade'l?) forpreventing the vibration of 'said saw blade. The line-fs 29a1so 'serveasa lubrn4 eatngeietrtbatag means and as e `guarra. se

lIolajm: Said lugs, *said lugs being,- provided With- `A)demountahle rnihaving the adjacent transverse notches, and a bar on Said bolt i endscorrespondingly bevelech an expansion resting in said notches and heldtheiein by l0v bolt -piyoted -to said rim ladjacent one en'd said nut,substantially aS described. 5 thereoijarpair of lugs on the other end ofIn testimony whereof I have signed my 1 the rim adapted to receivesaidholt hetweenk name to this specification, i* them, a nut' on saidiboltimpinging against ROBERT C. COLEMAN. i

to releasablyurge the feed screw 34 into engagement with the threadedend 40"" of' the carrier 40.'

'For' limiting the movement of the yoke member 3l an arcuate slot 49 isprovided j therein to receive a screwfO threaded into when in properoperating engagement with the casing l as shown in Fig. l, said slot andscrew serving to stop the feed screw 34 the carrier. A j suitable springactuated latch member 51V may be pivotally mounted von the exterior sideof the'casing frame 10a 'a device/in which the several 4objects of thisinvention are achieved 'and which is well adapted to meet the conditionsof practical use; j

As various'possible embodiments might be made of the above invention,and as various changes might be made in the embodiment above setforth,'it is to be understood that all matterl herein set forth or shownin the acy companying drawing is to be interpreted as yillustrative andnot in a limiting sense.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1 j` l. A portable power saw of the characterdescribed comprising a casing, a saw blade mounted thereon forreciprocating move.- ment, and a guide rest support slidably mounted tomove with respect to the casing for feeding the saw blade during thecutting operation.

2. A portable power saw of thecharacter described comprising a casing, asaw blade mounted thereon for reciprocating movement, a guide restsupport slidably mounted to the casing and means actuated by thereciprocating motion of the saw blade for moving said support withrespect to the casing for feeding the saw blade during'the cuttingoperation.

3. In a portable device of the character described, a casing, a sawblade mounted thereon for reciprocating movement and a guide restsupport movably secured `to kthecasing, and means connecting with thesaw blade to intermittently move the said support with respect to thesaw blade for feeding the latter during the cutting operation,

, said means including a rack secured to the saw blade, a gear wheelmeshing with the rack, and a feed screw having a ratchet and pawlconnection with said wheel for raising the said support. i

4. In a portable device of the character described, a casing, a sawblade mounted thereon for reciprocating movement and a guide restsupport movably secured to the casing, and means for movingthe saidsupport with respect to the casing for feeding the saw blade* during the`cutting operation, said means including a. feed screw and carriermember co-operatingly engaging'with said screw 'for raising the saidsup-port and a rack and pinion :for actuating said screw,

`thereon for reciprocating movement and a guide restsupport movablysecuredrelative to the casing, and actuated by the reciprocating motiongiven the saw bladeadapted to'feed the latter yduring the cuttingoperation, andv a `universally adjustable `means rfor setting the saidsupporty to various angles with respect to the saw blade.

7. Ina portable device of the character described, a casing, a saw blademounted thereo-n for reciprocating movement and `la guide rest supportmovably secured relative to the casing, and actuated by the recipro-veating motion given the saw` blade adapted to feed the latter during thecuttmgoperation and a universally adjustable double soA swivel forsetting the said support to various angles with respect to the sawblade, said means having an indicating scale to facilitate the settingof said support to any desired angle. i

8. I n a portable device of the characterr if described, a casing, a sawblade mounted thereon vfor reciprocating movement i and a guide restsupport movably securedto the casing, and means connecting with the sawblade to move the said support with respect to the saw blade for feedingthe latter during the cutting operation, said means including a feedscrew actuated by therecipc rocating motion given the saw blade, vacarrier memberco-operatingly engaging with said screw, and an adjustabledouble swivel coupling means connecting said carrier member withsaidsupport.

9. In a portable device ofthecharacter describeda casing, a saw bladekmountedv thereon for reciprocating movement and a guide rest supportkmovably secured to the casing, and means connecting with the saw bladeto move the said support with respect to the saw blade for feeding thelatter during the cutting operation, saidl means including a feed screwactuated by the reciprocatin'g motion given the saw blade5'- a` car`ri'er member co-operatingl'y engaging with with the said support toApermit setting the sawblade foi" cutting at various angles' with irespectV to the support.

10. In a portable device 'of the cli'aracter `describeC-L a casing,afsaw blade mounted z thereonfvfor reciprocating movement, al guide restSupport movably secured tothe casi-ng,

"a'f double swivel connection for mounting said` support,= and meansactuated by the reciprocating. motiongiveny the' saw blade tointermittently move the said support with ter Aduring tlielc'uftting'operation, and indica'tinggscalesf positioned adjacent said connectionsto" facilitate thesaid setting.- y

1l'.V A portable power* saw comprising a casing,- a saw blade mountedthereon tor reciprocting mov'el'rnent,y a.V guide rest support securedto the casing, means actuated by the saw'v blade `for movingsaitil'support with respect to the casing `for feeding the saw bladedriigf the cutting" operation, an'd means for automatically,makinfgsaidactuating means ineffective, said means being disengageably connectedwith the actuating means to perkmit quick resetting of the support.

121.` A portable ypower saw comprising a casing,f a saw' blade mountedthereon for reciprocating. movement, a guidel rest support secured, tothe casing,- means; actuated by the saw bladefor moving said. supportwith respect to the casin'gztor feeding'the saw blade during the cuttingoperation7 and means effectiveati limit of movementof said support formaking ysaid actuating means inoperative. 4 u 13. In a `portable deviceof Ithe cli'aracter describedl a casing, a saw blade mounted `*thereonfor' reciprocating movement and a guide rest support movably secured tothe casing,` and means for :moving Vthe saidsupport with'y respect tothe casing for feeding the saw blade during cutting operation, saidmeans including a fed screw and a carrier member actuated by the screwfor' rais- `ing the support, the engaging ofY said screw and carrierbeing inoperative at tlielimit of movement of said member. f

ln testimony whereof I afiifx my signature.

Lome eEoaGneooM-f.

Certificate of Correction.

Granted April 5, 1927, to LOUIS GEORGE ECONOM.

It is hereby certilied that error appears in the printed specificationof the above numbered pat-ent requiring correction as follows: Page 4:,line 49, claim 18, for the word fed read feed; and that the said LettersPatent should be read With this correction therein that the same mayconform to the record of the ease in the Patent Oliiee. 1

Signed and sealed this 26th clay of April, A. D. 1927.

' [SEAL] Patent No. 1,623,309.

M. J. MOORE,

Acing ommz'ssoner of Patents.

